JP2008013084A - Range changeover control device of automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a range changeover control device of automatic transmission for shortening a moving distance at a collision from the backside. <P>SOLUTION: A range changeover control device of automatic transmission including a select operation input unit 1; an actuator 3; a position sensor 33; and a controller 2, comprises a rear collision sensor 6 detecting collision from the rear of a vehicle, and when detecting the collision from the rear of the vehicle, the controller 2 switches a range position to an N range position if the range position is at a P range position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a range switching control device for an automatic transmission in a shift-by-wire system that detects an operator's selection operation, electrically controls an actuator, and switches the range of the automatic transmission.

Conventionally, in a shift-by-wire system, a position signal is output by an operator's select operation, an actuator is operated in accordance with this position signal, and the range position of the automatic transmission is switched. For suppression, control is performed by detecting an intermediate position of the range position (see, for example, Patent Document 1).
In addition, when the vehicle is in the D range position or the R range position at the time of a collision, there is also one that moves the range position to a neutral state in order to avoid unintended movement of the vehicle (see, for example, Patent Document 2).
In some cases, a traffic mode is provided and a brake is applied to prevent a collision (secondary collision) with a preceding vehicle when a rear-end collision occurs (see, for example, Patent Document 3).
JP 2002-349703 A (page 2-5, full view) JP 2002-139143 A (page 2-15, all figures) JP 2000-158773 A (page 2-17, full view)

  However, in the conventional automatic transmission range switching control device, when the automatic transmission is in the range of the P-range position and the vehicle is collided from the rear of the vehicle while stopped, the vehicle is pushed out by impact. In that case, there is a demand to shorten the moving distance as much as possible and avoid secondary collisions with other vehicles and people. In addition, it is desirable that the treatment for shortening the moving distance is surely performed.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to provide an automatic transmission range that can reliably reduce the moving distance when rear-end collision is further performed. It is to provide a switching control device.

  To achieve the above object, according to the present invention, an operation input means for a driver to input a range position selection operation, an actuator for operating a range switching means of an automatic transmission by a motor and a speed reduction mechanism, and the actuator is operated. A range switching control device for an automatic transmission, comprising: a range position detecting means for detecting a range position; and a control means for controlling the actuator based on the select operation and the detected range position. And a foot brake driving means for turning on the foot brake by driving. The control means detects a collision from the rear of the vehicle, and when the range position is the P range position, the range position is set to the N range. Switch to the position and operate the foot brake drive means to drive the foot brake. To, characterized in that.

  Therefore, in the present invention, the moving distance when rear-end collision from the rear can be surely shortened as compared with the conventional case.

  Hereinafter, an embodiment for realizing a range switching control device for an automatic transmission according to the present invention will be described based on Example 1 and Example 2 corresponding to the invention according to claim 1.

First, the configuration will be described.
FIG. 1 is a system block diagram of the shift-by-wire system according to the first embodiment.
The shift-by-wire system according to the first embodiment mainly includes a select operation input unit 1, a controller 2, an actuator 3, an automatic transmission 4, a wire cable 5, a rear collision sensor 6, and a foot brake drive device 7.
The select operation input unit 1 inputs a range position (select position) to be switched, and may be input by a select lever or a switch. The input select position is output to the controller 2.

The controller 2 drives the actuator 3 so that the range position coincides with the select position set as a target from the select operation input unit 1, the rear collision sensor 6, and the range position on the automatic transmission side. Control is performed so that the range position 4 is switched.
The actuator 3 includes a motor 31, a speed reduction mechanism 32, and a position sensor 33. The motor 31 is driven by the control of the controller 2, the output of the motor 31 is decelerated by the speed reduction mechanism 32, and the wire cable 5 connected to the mechanism is push-pull.

As a result, the control lever (not shown) of the automatic transmission 4 to which one end of the wire cable 5 is attached is operated to switch the range position.
The position sensor 33 detects the position displacement of the mechanism to detect the range position of the automatic transmission 4 and outputs it to the controller 2.
The rear collision sensor 6 is a sensor 6 that detects a collision to the rear of the vehicle by detecting an impact on the rear of the vehicle.
In addition, the vehicle carrying the shift-by-wire system of the first embodiment is assumed to be equipped with ABS (anti-lock braking system).

Furthermore, in Example 1, the footbrake drive device 7 which operates a footbrake by control irrespective of a driver's operation is provided.
The foot brake driving device 7 is provided as a part of the ABS system 8 in the second embodiment.

Next, the operation will be described.
[About shift-by-wire systems]
In the shift-by-wire system of the first embodiment, when a select position is input to the select operation input unit 1, the select position is input to the controller 2 as an electrical signal. The controller 2 compares the current range position based on the range position information from the position sensor 33 with the select position, and if they do not match, the actuator 3 is driven so that the range position becomes the select position, and the wire cable The control lever of the automatic transmission 4 connected by 5 is operated to switch the range position.
In other words, drive control is performed so that the range position is switched by the actuator 3 by feedback control targeting the select position.
As a result, the operating driver can switch the range position by a lever operation that is smaller and lighter than before, or by a simple input operation to the switch.

[Treatment at the time of collision with the rear of the vehicle]
FIG. 2 is a flowchart showing a flow of processing at the time of a collision with the rear portion of the vehicle, which is executed by the controller of the automatic transmission range switching control device according to the first embodiment. Each step will be described below.
In step S1, it is shown that it is determined in the following steps whether or not the following vehicle has collided with the own vehicle by a signal from the rear collision sensor 6.

  In step S2, it is determined whether or not the following vehicle has collided with the own vehicle based on a signal from the rear collision sensor 6, and if a collision occurs, the process proceeds to step S3, and if not, the process ends.

  In step S3, it is determined whether or not the range position of the automatic transmission 4 is the P range position. If the range position is the P range position, the process proceeds to step S4.

  In step S4, the actuator 3 is driven to forcibly switch the range position to the N range position regardless of the select position input from the select operation input unit 1.

  In step S5, an operation command is output to the foot brake driving device 7 to forcibly turn on the foot brake.

[Moving distance shortening effect at rear collision]
In the automatic transmission range switching control apparatus according to the first embodiment, when a collision is detected, the P range position is forcibly switched to the N range position.
Then, the own vehicle collided with the rear part tends to move forward by the impact force.
In the first embodiment, the foot brake driving device 7 is activated and the foot brake is forcibly turned on by switching to the N range position by the process of step S5.

  Then, when the vehicle that has collided with the rear part moves forward due to the impact force, the foot brake driving device 7 forcibly applies the foot brake even if the driver does not step on the foot brake or cannot step on the foot brake. It is turned on, the ABS is activated, the tire is not locked, and the braking distance is kept short.

If the vehicle is in the P range position, the vehicle controls the ABS so that the ABS does not operate due to the P range position. Therefore, if the tire is locked, the braking distance is long. turn into.
In order to operate the ABS, switching to the D range position is also conceivable. However, after the ABS acts and stops at the D range position, there is a possibility that the vehicle may move further forward due to creep and become a secondary collision. Therefore, the N range position is set.

  Thus, by switching the range position so that the ABS is operated not only in the case of normal traveling but also in the case of a rear collision, the moving distance of the vehicle in the case of a rear collision can be further reduced.

Furthermore, since the foot brake is forcibly turned on, it is possible to more reliably reduce the moving distance of the vehicle at the time of a rear collision.
Note that once this control is activated, the footbrake on state will continue, but once the vehicle IGN power is turned off, the brake actuated state may be released.

Next, the effect will be described.
In the automatic transmission range switching control apparatus according to the first embodiment, the following effects can be obtained.

  (1) A selection operation input unit 1 for a driver to input a range position selection operation, an actuator 3 for operating a control lever of the automatic transmission 4 by a motor 31 and a speed reduction mechanism 32, and a range position for the actuator 3 to operate. A rear collision sensor for detecting a collision from the rear of a vehicle in a range switching control device for an automatic transmission comprising a position sensor 33 to detect and a controller 2 for controlling the actuator 3 based on a select operation and the detected range position 6 and a foot brake driving device 7 for turning on the foot brake by driving. The controller 2 detects a collision from the rear of the vehicle, and when the range position is the P range position, the range position is changed to the N range position. In order to switch and activate the foot brake drive device 7 to drive the foot brake on, the driver Do not operate the rake, even when it is not possible to operate, it is possible to reliably reduce unintended movement distance forward of the vehicle when the rear collision.

  In addition, at present, the use of an ABS system widely used in vehicles is advantageous in that existing vehicles can be equipped with reduced costs.

The second embodiment is an example in which the driver operates the foot brake at the time of a rear collision.
FIG. 3 is a system block diagram of a shift-by-wire system according to the second embodiment.
In the second embodiment, the foot brake is operated by the operation of the driver.
In the second embodiment, the vehicle is provided with an ABS system 8.

[Treatment at the time of collision with the rear of the vehicle]
FIG. 4 is a flowchart showing a flow of processing at the time of a collision with the rear portion of the vehicle, which is executed by the controller of the range change control device for the automatic transmission of the second embodiment. Since the steps are the same as those in the flowchart, the same reference numerals are given, and the description is omitted.

  In the second embodiment, the processes of steps S1 to S4 that do not perform the process of step S5 of the first embodiment are performed.

[Moving distance shortening effect at rear collision]
In the automatic transmission range switching control apparatus according to the second embodiment, when a collision is detected, the P range position is forcibly switched to the N range position.
On the other hand, the driver steps on the foot brake to stop the unintended advance of the vehicle. In this braking state, by switching to the N range position, the ABS operates, the tire is not locked, and the braking distance is kept short.

Next, the effect will be described.
The range change control device for the automatic transmission according to the second embodiment is not as reliable as the effect (1) of the first embodiment, but the second embodiment in which the driver is the main subject to the driver's request or the like. You may make it perform the structure effect | actions.
In addition, in the automatic transmission range switching control apparatus according to the first embodiment, a driver-based mode as in the second embodiment may be added to perform switching by a driver selection operation. In that case, it is possible to reduce the unintentional travel distance of the vehicle ahead in the event of a rear collision by controlling the driver's intention.
Therefore, in such a case, the following effects can be obtained.

  (2) In (1), the controller 2 detects a collision from the rear of the vehicle, and in advance, when the range position is the P range position, the operation of the foot brake drive device 7 when switching the range position to the N range position is performed in advance. Since it is set according to the driver's selection, it is possible to reduce the unintentional travel distance of the vehicle ahead in the event of a rear collision by controlling the driver's intention.

  As mentioned above, although the range change control apparatus of the automatic transmission of this invention has been demonstrated based on Example 1 and Example 2, it is not restricted to these Examples about a concrete structure, Claims Modifications and additions of the design are permitted without departing from the spirit of the invention according to the claims.

For example, in the first embodiment, the foot brake driving device is incorporated in the ABS system, but may be provided separately from the system.
Here, for example, an example of a foot brake drive device will be described. The foot brake drive device is driven by an actuator and a mechanism to drive an ON input to an input system to the master cylinder, that is, an operation input of a driver. May be performed.
Further, for example, a foot brake driving device may be provided as a circuit or a program in the ABS system, and the brake may be forcibly turned on by controlling supply hydraulic pressure to the master cylinder in the ABS system.

1 is a system block diagram of a shift-by-wire system according to Embodiment 1. FIG. It is a flowchart figure which shows the flow of the process at the time of the collision to the vehicle rear performed by the controller of the range switching control apparatus of the automatic transmission of Example 1. FIG. It is a system block diagram of the shift-by-wire of Example 2. It is a flowchart figure which shows the flow of the process at the time of the collision to the vehicle rear part performed with the controller of the range switching control apparatus of the automatic transmission of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Select operation input part 2 Controller 3 Actuator 31 Motor 32 Deceleration mechanism 33 Position sensor 4 Automatic transmission 5 Wire cable 6 Rear collision sensor 7 Foot brake drive device 8 ABS system

Claims (1)

An operation input means for the driver to input a range position selection operation;
An actuator for operating a range switching means of the automatic transmission by a motor and a speed reduction mechanism;
A range position detecting means for detecting a range position operated by the actuator;
Control means for controlling the actuator based on the select operation and the detected range position;
In an automatic transmission range switching control device comprising:
A collision detection means for detecting a collision from the rear of the vehicle is provided,
Provide foot brake drive means to turn on the foot brake by driving,
The control means includes
A collision from the rear of the vehicle is detected, and when the range position is the P range position, the range position is switched to the N range position, and the foot brake driving means is operated to turn on the foot brake.
A range change control device for an automatic transmission.

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